Spain remained neutral throughout World War I between 28 July 1914 and 11 November 1918, but despite domestic economic difficulties, it was considered "one of the most important neutral countries in Europe by 1915". Spain had enjoyed neutrality during the political difficulties of pre-war Europe, and would continue its neutrality after the war until the Spanish Civil War began in 1936. While there was no direct military involvement in the war, German forces were interned in Spanish Guinea in late 1915.